Kyuseok Shim Timos K. Sellis Dana S. Nau Improvements on a Heuristic Algorithm for Multiple-Query Optimization. 197-222 1994 12 Data Knowl. Eng. 2 db/journals/dke/dke12.html#ShimSN94 http://dx.doi.org/10.1016/0169-023X(94)90014-0